EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

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6/08/2017  |   3:00 PM - 3:15 PM   |  EXPLORING THE ISOTOPIC NICHE OF ROCKY MOUNTAIN-GREAT PLAINS FISH COMMUNITIES   |  302B

EXPLORING THE ISOTOPIC NICHE OF ROCKY MOUNTAIN-GREAT PLAINS FISH COMMUNITIES

Just as the increase in species richness from the poles to the equator is one of the most consistent biogeographical patterns of species distributions, so too is the longitudinal increase in fish species richness from headwaters to lowland rivers. In these ecosystems, we hypothesize that community expansion in fish communities occurs mainly through niche expansion rather than niche packing, whereby the expanded community occupies a large niche space, has low niche overlap among species, and high individual diet specialization. To test this hypothesis, we use carbon (d13C) and nitrogen isotope (d15N) analysis to measure niche widths and individual specialization in fish communities found along the longitudinal gradient in the North Platte River Basin, USA. In this talk, we address the following questions: 1) How is isotopic variability (i.e. niche position and breadth) within local fish communities structured across a river basin, i.e., are species’ niches conserved along the longitudinal gradient? And, 2) how does inter-individual diet variation (i.e. individual specialization) contribute to the isotopic niche breath and overlap of fish communities?

  • C18 Biodiversity
  • C25 Food Webs
  • S30 The future of trait-based approaches in research and management

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Presenters/Authors

Bryan Maitland (), University of Wyoming, bmaitlan@uwyo.edu;


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Frank Rahel (), University of Wyoming, frahel@uwyo.edu;


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